On page 15 Siemens defines connectivism as "the assertion that learning is primarily a network-forming process."
There is no doubt that web 2.0 tools can aide in connectivism, and that connectivism is desirable in the classroom. The battle for any teacher is, and always has been, getting his or her students to make connections among nodes of knowledge. This usually requires a certain degree of emotional involvement on the part of the student. Web 2.0 tools can certainly aide in creating an environment for emotions to become involved so that connections and learning can occur, however to assume that because a teacher is having his or her students blog or enter data on a wiki as opposed to discuss in class or create more "traditional" projects in the classroom setting that said teacher's students are engaging in connectivism and learning.
The challenge to us teachers still remains that of relevancy. Students can just as easily mindlessly blog or enter information within a wiki as they can mindlessly journal or fill out a worksheet. No matter what tools we use, it will be crucial to create relevancy for our students.
There is no doubt that packaging the information in a way that is familiar to students helps and that is why I'm immensely excited about using web 2.0 tools during this upcoming school year.